Ore-roasting furnace.



No.s4 7,75s PATENTED MAR. 19*, 1907.-

' G. H. FRANKLIN.

ORE ROASTING FURNACE. APPLICATION FILED n50, 1,'1906'.

ew/ /m/r/m THE NORRIS PETERS 50-, WAHINGTONI n. c.

GEORGE FRANKLIN, OF BOULDER, COLORADO.

ORE-ROASTING FURNACE.

Specification of Letters Patent.

Patented March 19, 1907.

A li ati fil d December 12, 1906. Serial No. 347,445.

To alt whom it may concern:

Be it known that I, GEORGE H. FRANKLIN,

of Boulder, in the. county of Boulder and State of Colorado, have invented certain new and useful Im rovements in Ore Roasting Furnaces; and hereby declare that the following is a full, clear, and eXact description thereof, reference being had to the accompanying drawings, which form part of this specification.

This invention is an improvement in oreroasting furnaces of that class in which the ore descends by gravity over inclined planes or shelves to a conveyer; and the objects of the present invention are to provide a very efficient, durable, and cheap construction of furnace in which the shelves will be thoroughly and efficiently heated and all the ore passing therethrough will be acted upon by the heat and will not be liable to clog or choke the fines or ore-passagesf to make the interior parts readily changeable, so that repairs can be made economically and quickly when necessary, and to substantially do away with all interior metal work and while providing ample supports for the shelves to leave large passages for both ore and products of combustion.

The invention consists in the novel construction of the interior parts of the furnace and in the combinations of parts hereinafter described with reference to the accompanying drawings, and the features for which pro-. tection is desired are set forth in the claims.

The furnace, generally speaking, is preferably rectangular in plan and has a vertical ore-roasting chamber, through which the ore is passed by gravity from to to bottom, this chamber being provided wit inclined shelves arranged in tiers one above the other, the alternate superposed shelves slanting in 0pposite directions, so as to discharge the ore from one to the other, and separated, so as to leave passages for products of combustion between the shelves, the ore dropping from the lowermost shelves into a hopper, from whichit'is removed by a suitable conveyer. The products of combustion enter the lower part of the furnace and ass upwardly around and between the she ves and finally escape at the top of the furnace.

I will now describe the construction in detail with reference to the drawings.

In the drawings, Figure 1 represents a cross-section of the furnace on the line 1 1, Fig. 2. Fig. 2 is a longitudinal section on the line 2 2, Fig. 1. Figs. 3, 4, and 5 are detail plan views of different shelves in the furnace as shown by and looking in the direction of the arrows 3, 4, and 5 in Fig. 1, respectively. Fig. 6 is a perspective detail of one of the side-shelf supports. Fig. 7 is a detailed section on the line 7 7, Fig. 1, showing the method of embedding the side-shelf supports in the wall.

The furnace comprises a roasting-chamber which is substantially rectangular in crosssection and of any desired height, according to the number of shelves therein. As shown it is formed with a hopper-bottom, above which is a combustion-chamber S and above the latter four tiers of centrally-disposed shelves O B B A and three series of side shelves D D D, arranged one above the other and alternating with the shelves O B B A, as shown, so that shelves A discharge onto the uppermost shelves D, the latter onto the uppermost shelves B, these in turn onto the intermediate shelves D, and these onto the next lower shelves B, which in turn deliver onto the lowermost shelves D, and the latter discharge onto the lowermost shelves O, which in turn deliver the roasted ores into the hopper Y, from which they are removed by a conveyer X. The shelves extend from front to rear wall of the furnace and are preferably constructed in sections, as hereinafter explained. The shelves C B A, moreover, are arranged in pairs slanting in opposite directions and respectively toward opposite sides of the roastingchamber. The lowermostshelves O are supported at their ends by embedding them in slots in the end walls of the roasting-chamber (see Figs. 2 and 5) and are supported mediately by a fire-brick support H, mounted upon the side walls of the combustion-chamber S, which latter is centrally sustained by a cross-beam R, of iron. The support H has lugs k on its lower end to prevent its lateral displacement on the combustion-chamber, and it has lugs h on its sides to support the lower edges of the shelves C, and it is also provided with tenons h on its side edges, which engage openings or notches c in the shelves O, as shown in Figs. 1 and 5, to uphold the shelves in place. Preferably the shelves O are made in transverse sections, as indicated in Fig 5, the sections meeting above the support H.

The superposed shelves B are supported at their ends in slots in the end walls of the furnace and intermediately by supports F,

ICC

which are notched at bottom to fit upon the beveled ridge formed by the underlying shelves. Thus the supports F for the lowest shelves B are fitted into recesses c in the upper edges of shelves C, as shown, and the supports F F for the superposed shelves B and A are similarly fitted into notches b in the underlying shelves B. The supports F are provided with tenons f on their upper edges, adapted to engage slots Z) in the superposed shelves, as indicated in Figs. 1 and 4, and hold the shelves securely in position. Pref erably the shelves A B are also made in sections, as indicated in Fig. 4, the sections meeting above the underlying supports F.

The side shelves D are supported partly by the side walls of the furnace, in which their upper and end edges are fitted, as indicated in Figs. 1 and 3, and are further supported at the proper angles by means of supports M, which are each formed with a T-fiange in its rear edge, by which they are embedded and locked in the side wall of the roasting-chamber, as indicated in Figs. 2 and 7, and whose inner upper edge is slanted at the proper angle and is provided with tenons m, adapted to engage openings (1 in the shelves D, as indicated in Figs. 1 and 3. The shelves D are preferably also made in sections, as indicated in Fig. 8, the sections meeting over the supports M.

It will be observed that the shelves in the successive tiers are arranged at successivelyincreasing inclinations, the bottom shelves being much more inclined than the uppermost shelves. This is for the purpose of causing the ore to descend with increasing rapidity, being detained longest on the uppermost shelves, where subjected to less heat, and passing more rapidly over the lower shelves, where the heat is greater.

Above the uppermost central shelves A is a divider T, which is provided with opposite diverging wings t, which depend on opposite sides of the outlet-pipe N toward the oppositely-inclined shelves A A, respectively, and the apex of the divider comes beneath the inlet pipe or chute G, which is connected with any suitable ore-supplying device, (not shown,) the construction being such that the ore delivered into the chamber through pipe G is separated into two substantially equal portions by the divider T, and these portions descend the opposite tiers of shelves A D B D B D C to the hopper Y, whence the roasted ore is removed by conveyer X. The divider extends across the roasting-chamber but the outlet-pipe N terminates at about the center of and under the divider, so that the wings of the latter act as guards or deflectors to prevent the currents of hot gases shortcircuiting through the roastingchamber and direct them uniformly into the outlet-pipe N, while preventing small particles of ore being withdrawn therethrough. Outlet-pipe N is for the purpose of withdrawing the hot gases and products of combustion to any suitable condenser (Not shown.)

The shelf-supports F do not form a solid wall across the furnace, but are arranged at intervals below the superposed shelves and allow perfectly -free communication between the two sides of the furnace. I do not restrict myself to any particular size of furnace or number of shelves vertically, nor to any particular number of sections of shelves horizontally, as all of these can be varied to suit the special requirements of the builder.

The roasting-chamber is provided with. openings P, having covers 2), for the purpose of observing the operation of the furnace and also for cleaning oil the shelves should the falling ore in any way become clogged between them. The first tier of supports F fit into rectangular channels 0 in the shelves C, and the shelves B fit over the top of the supports F, engaging the projections f as above explained. The next supports F have their lower ends resting in the channels 1). Channels 1) are formed. by the adjacent grooves in the sections of shelves B. The uppermost shelves A do not have these grooves, as there are no supports F above these shelves.

In Fig. 1 is shown in dotted lines the position of the furnace arch and. bridge\vall. The combustion-chamber S is supported. by the beam R, as shown, which in turn. supports the entire series of central shelves above. At the bottom of the furnace is the spiral conveyer X, the hopper above it having inclined sides Y, extending from the spiral conveyer to the sides of the roastingchamber. a: is a sprocket-wheel for driving the spiral conveyer, and 0c 35- form a stuflingbox to prevent dust from reaching the rear bearing of the spiralconveyer shaft. Z is a pocket at the front of the conveyer, into which the same discharges and. from which the roasted ore may be taken as desired. If it is desired to increase the size of the roasting-chamber, any number of sections of shelves may be added longitudinally and a corresponding number of supports it, ll, and F being used. The various shelves are all held by their corresponding supports in a similar manneri. e., by the tcnons or projections hf m, as shown. The walls may be built of ordinary brick with lire-brick lining, and all the interior parts S, 1'], C, F, B, A, M, and D are made of fire-brick or of other fire-resisting material.

Having described my invention, what 1 claim as new, and desire to secure by Letters Patent, is

1. In an ore-roasting furnace, the combination of a roasting-chamber, a series of inclined shelves, of successively greater inclination from top to bottom, arranged one above the other within and extending from clined shelves'of successively greater inclination from top to bottom, arranged one above underlying shelves.

the other centrally within and extending from end to end of the chamber, with oppositely-inclined shelves on the opposite sides of the chamber alternating with the central shelves, and of successively greater inclination from top to bottom, a feed-inlet at the upper end of the chamber, an outlet below the inlet and a spreader interposed between the outlet and inlet.

3. In an ore-roasting furnace, the combination of a roasting-chamber, a superposed series of shelves disposed centrally in said chamber and extending from end to end thereof; and refractory supports for the several upper shelves mounted upon the several 4. In an ore-roasting furnace, the combination of a roasting-chamber, a superposed series of shelves in said chamber and extend ing from end to end thereof; with refractory supports for the upper shelves mounted upon the underlying shelves, and provided with tenons engaging openings in the shelves.

5. In an ore-roasting furnace, the combination of a roasting-chamber, a combustionchamber in the lower part thereof, an ular supports mounted on said chamber, inc ined shelves mounted on said supports, refractory supports mounted on the apex of such shelves, superposed shelves mounted on said supports, and oppositely-inclined shelves supported on the side walls of the furnace intermediate the central shelves.

6. In an ore-roasting furnace, the combination of a roasting-chamber, an ular supports mounted in the lower part thereof, inclined shelves mounted on said supports, refractory supports mounted on the apex of the lower shelves, superposed shelves mounted on said supports, said supports having tenons engaging openings in the shelves, and oppositely-inclined shelves supported on the side walls of the furnace.

7. In an ore-roasting furnace, the combination of a roasting-chamber, oppositely-inclined shelves in the lower part thereof, and a triangular refractory support for said shelves having tenons on its upper inclined edges engaging openings in the shelves,

8. In an ore-roasting furnace, the combination of a roasting-chamber, oppositely-inclined shelves in the lower part thereof, and a triangular refractory support for said shelves having tenons on its upper inclined edges engaging openings in the shelves, said shelves being made in sections with their meeting edges resting upon the support.

In an ore-roasting furnace, the combination. of inclined shelves, refractory su ports having inclined portions underlying t e shelves and provided with tenons on their upper edges engaging openings in the shelves, said shelves being in sections, the meeting edges of the sections rest-ing upon the edges of the supports.

10. In combination in an ore-roasting chamber, a series of superposed oppositelyinclined shelves arranged centrally in said chamber, a refractory support for the lower shelf, refractory supports for the upper shelves, the supports for an upper shelf resting upon the next lower shelf, said supports being spaced apart and provided with devices interlocking with the shelves.

11. In an ore-roasting furnace, the combination of a fire-chamber, a combustion-chamber, a roasting-chamber above the combustion-chamber, a series of oppositely-inclined shelves arranged one above the other, refractory supports for the lower shelf upon the combustion-chamber walls, refractory supports for the upper shelves superposed u on the next lower shelf, side shelves arrange intermediate the central shelves at op osite sides of the roasting-chamber, incline su ports for the side shelves anchored in t e walls of the chamber, a feed-inlet above the uppermost shelf, an outlet above the shelves, and a divider interposed between the feedinlet and uppermost shelf.

12. In an ore-roasting furnace, the combination of a fire-chamber, a combustion-chamber, a roasting-chamber above the combustion-chamber, a series of oppositely-inclined shelves arranged one above the other, and extending longitudinally of the roastingchamber, refractory supports forthe lower shelf upon the combustion-chamber walls, refractory supports for the upper shelves superposed upon the next lower shelf, side shelves arranged intermediate the central shelves at opposite sides of the roastingchamber, inclined supports anchored in the walls of the chamber, to support the side shelves, a feed-inlet above the uppermost shelf, an outlet above the shelves, a divider most shelf, an orereceiving'chamber below the combustion-chamber, and means for removing the roasted ores therefrom.

13. In an ore-roasting furnace, the combination of a fire-chamber, a combustion-chamber, a roasting-chamber above the combustion-chamber, a series of op ositely-inclined shelves arranged one above t he other, refractory supports for the lower shelf upon the combustion-chamber walls, refractory supports for the upper shelves superposed UAPOII the next lower shelf, side shelves arrange in- IIO .interposed between the feed-inlet and upper termediate the central shelves at op osite sides of the roasting-chamber, incline supports for the side shelves anchored in the walls of the chamber, a feed-inlet above the. uppermost shelf, an outlet above the shelves, and a divider interposed between the feedinlet and uppermost shelf, said shelves being made in sections, the meeting edges of the sections resting upon the refractory supports i l I and sight-openings in the Walls of the chani- 10 her adjacent the ends of the shelves.

.ln-testimony that I claim the foregoing as my own I atlix my signature in presence of two Witnesses.

GEORGE H. FRANKLIN. Witnesses:

CARL L. Gnoss, 1?. H. MALLINoKRonT. 

